kikeelect / Misty Coffee Holodeck

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Temperature and Humidity Sensor Node Design

kikeelect

kikeelect

Make me a temperature and humidity sensor node with Wifi and Bluetooth, powered by USB-C (5V) for consumer use.
It should be a low-power environmental node with a digital T/RH sensor, ultra-low-power MCU with Wi-Fi + Bluetooth (dual-radio) — 2.4 GHz 802.11 b/g/n plus BLE 5.x powered by USB-C (5 V) — USB-C receptacle 5 V default; include reverse/OVP/UVLO/OCP protection and plan for 0.5–3 A sources.
16 days

flux

1:12

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Your goal is a low-power consumer temperature/humidity sensor node with Wi‑Fi, Bluetooth, and protected USB‑C 5 V input.
  • I’ve prepared the plan.
  • It covers system architecture, USB‑C power/protection, sensor + wireless processing, and power distribution/final schematic verification.
  • It’s ready to execute.
Click Start on the plan bar to build it. Let me know if you want any requirement changed first.
Plan
#Goal
  • Design a low-power consumer temperature and humidity sensor node that integrates a digital temperature/relative humidity sensor with an ultra-low-power MCU featuring dual-radio 2.4 GHz 802.11 b/g/n Wi-Fi plus BLE 5.x. The sensor node will be powered from a USB-C receptacle (5 V default) incorporating robust input protection for reverse polarity, over-voltage, under-voltage lockout, and over-current conditions, safely accepting power sources ranging from 0.5 A to 3 A.
#Implementation plan
  1. System Architecture Definition
    1. Define and document the sensor node subsystems: the digital temperature/humidity sensing module, the ultra-low-power dual-radio MCU, and the USB-C power & protection subsystem.
    2. Update the project description with these functional goals and architecture details.
  2. USB-C Power and Protection Circuitry
    1. Add a USB-C receptacle and design the 5 V input power path.
    2. Integrate protective components to safeguard against reverse polarity (using diodes or MOSFET-based circuits), over-voltage (TVS or dedicated OVP IC), under-voltage lockout (UVLO circuitry), and over-current (resettable fuse or current limiting circuit).
    3. Document and verify that the protection circuit accommodates power sources between 0.5 A and 3 A.
  3. Sensor and MCU Integration
    1. Select and add a digital temperature/relative humidity sensor component from the library (e.g., a generic SHT series sensor) configured for digital communication (e.g., I²C).
    2. Select and add an ultra-low-power MCU with dual-radio capabilities (e.g., an Espressif ESP32 series device) to the schematic.
    3. Connect the sensor to the MCU via the appropriate digital interface.
    4. Provide any necessary level-shifting or interfacing elements if the sensor and MCU operate on different voltage levels.
  4. Power Regulation and Distribution
    1. Evaluate if a voltage regulator is required to step down 5 V to the operating voltage of the MCU and sensor (if they require 3.3 V), and add the regulator if needed.
    2. Ensure proper decoupling and filtering near the MCU and sensor.
  5. Schematic Finalization and Documentation
    1. Review and verify all connections to ensure they meet the low-power, protection, and connectivity specifications.
    2. Add clear labels and annotations for each major block (power protection, sensor subsystem, MCU/digital interface).
    3. Update the project metadata to reflect the design objectives and readiness for prototyping.
#Success criteria
  • A complete schematic that integrates the digital temperature/humidity sensor with an ultra-low-power dual-radio MCU and a fully-protected USB-C power input stage.
  • The USB-C protection circuit reliably handles reverse polarity, over-voltage, under-voltage lockout, and over-current protection while accommodating sources from 0.5 A to 3 A.
  • Functional connections between sensor, MCU, and power are verified, ensuring readiness for further PCB layout and prototyping.
Add ESD too
Use ESP32-C6
Prefer 3.3V rail
16 days
​
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